Script to pull remote database and overwrite local

pull-db.sh

function exit_script() {
  echo $1
  ssh -S db-sync-socket -O exit $REMOTE_CREDENTIALS 2> /dev/null
  exit 1
}
function print_usage() {
  echo "Usage: -d databasename -m host [-h]"
  exit 0
}

# Get All Variables
# ------------------------------------------------------------------------------------------------------------
while getopts :l:r:m:h OPTION; do
  case $OPTION in
    l) LOCAL_DB=$OPTARG ;;
    r) REMOTE_DB=$OPTARG ;;
    m) HOST=$OPTARG ;;
    h) print_usage ;;
    \?) exit_script "Invalid option -$OPTARG. Please run '-h' for help" ;;
    :) exit_script "Option -$OPTARG requires an argument. Please run '-h' for help" ;;
  esac
done
shift $((OPTIND - 1))

# Sanity checks
# ------------------------------------------------------------------------------------------------------------
echo "Validating all variables have value..."
SCRIPT_VARS="REMOTE_DB LOCAL_DB HOST"
for SCRIPT_VAR in $SCRIPT_VARS; do
  [[ -z ${!SCRIPT_VAR} ]] &&
    exit_script "ERROR: Variable $SCRIPT_VAR must have a value."
done

ssh -f $HOST -L 27018:localhost:27017 -N
mongo $LOCAL_DB --eval 'db.dropDatabase();'
mongo $LOCAL_DB --eval "db.copyDatabase(\"$REMOTE_DB\", \"$LOCAL_DB\", 'localhost:27018');"